Statistics Practice Test 1

The mean temperature of Monday to Wednesday = 37°C
Total Temperature = 37 × 3 = 111°C
Temperature from Tuesday to Thursday = 34°C
So, Total temperature = 102° C
Monday + Tuesday + Wednesday = 111°C...(i)
Thursday + Tuesday + Wednesday = 102°C...(ii)
(i) - (ii)
Monday - Thursday = 9°C
Let the temperature on Monday = x
Let the temperature on Thursday $=\frac{4}{5}\mathit{x}$
$\mathit{x}-\frac{4}{5}\mathit{x}=9\Rightarrow \mathit{x}=45°$
Temperature on Monday = 45°
Temperature on Thursday $=\frac{4}{5}\times 45°=36°\mathit{C}$